Electronic monitoring system and responder device

Details Electronic monitoring system and responder device Electronic monitoring system and responder device

1976-06-17

1978-06-13

Caldwell, Sr., John W.

Communications: electrical

Systems

Call station

340279, 340280, G08B 1300, G01D 2104

Patent

active

040952142

ABSTRACT:
An electronic monitoring system for monitoring the passage of objects, such as persons, past a monitoring station. An antenna is provided flat on the floor of the station to generate electromagnetic fields in the vicinity of the station and to generate electrical alarm signals whenever the electromagnetic fields are disturbed by the passage of an object carrying a special responder device. The responder device comprises an elongated bar of ferromagnetic material about which is wound the coil of a resonant electrical circuit. A mounting strap is provided to mount a responder device the leg of each object to be monitored such that the elongated bar is held perpendicular to the floor whereby maximum electrical interaction is provided between the antenna and the resonant electrical circuit.

REFERENCES:
patent: 3098971 (1963-07-01), Richardson
patent: 3115622 (1963-12-01), Jaffe
patent: 3164793 (1965-01-01), Aronson
patent: 3182315 (1965-05-01), Sweeney
patent: 3478344 (1969-11-01), Schwitzgebel
patent: 3493955 (1970-02-01), Minasy
patent: 3500373 (1970-03-01), Minasy
patent: 3591995 (1970-11-01), Fathauer
patent: 3868669 (1975-02-01), Minasy

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